Negligence on the part of police allowed one of the suicide bombers in the Brussels attacks to avoid arrest after he was deported by Turkey as a terrorist last year, Belgium’s Interior Minister, Jan Jambon, told the Belgian parliament.

The Interior Minister offered up his resignation over the matter on Thursday, but Charles Michel, the head of the Belgian government, refused to accept it.

Turkish authorities said earlier this week that Ibrahim El Bakraoui had been detained and expelled to Europe last July, with Ankara warning Belgium that he was a suspected terrorist who had tried to join Islamic State (IS, Daesh, formerly ISIS/ISIL) in Syria.

Ibrahim and his brother Khalid El Bakraoui, both Brussels residents, were the suicide bombers responsible for explosions that rocked the airport and a central subway station in Brussels on Tuesday, killing at least 31 people.

Ibrahim reportedly blew himself up at the airport, while Khalid set off the blast on the metro.